Here is a listing of the characteristics of soil texture groups and their corresponding soil texture classes. 

Characteristics soil texture group Corresponding soil texture classes from the Soil Texture Triangle 
Coarse Sand Coarse sand  Fine sand
Coarse Loamy coarse sand  Loamy fine sand Loamy very fine sand 
Coarse Very fine sand Loamy sand  
Medium Silt  Sandy clay loam Very fine sandy loam
Medium Silty clay loam Silt loam  Loam
Medium Fine sandy loam Sandy loam Coarse sandy loam
Medium Clay loam     
Fine Sandy clay  Silty clay  Clay 

Source: The soil texture classes are from the Soil Science Society of America, 
http://www.soils.org/
. An NRCS team partitioned the soil textures into the three groups.

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